[2] Following a successful UEFA European Championship 2013 tournament with Denmark, Lykke Borg secured a transfer from Brøndby to FCR 2001 Duisburg.

[10] In Denmark's opening group match against hosts Sweden she saved two second half penalty kicks from Lotta Schelin and Kosovare Asllani, respectively, to secure a 1–1 draw.

Lykke Borg stopped Louisa Nécib's kick in the shoot-out, after narrowly failing to keep out the same player's penalty goal during the match.

Lykke Borg remained the first choice goalkeeper at UEFA European Championship 2017, and saved a penalty from Caroline Graham Hansen in Denmark's 1–0 group stage win over Norway.

In June 2018, Lykke Borg retired from international football following a 5–1 2019 FIFA World Cup qualification – UEFA Group 4 win over Hungary in Viborg.